Parts for your 1998 Daihatsu Terios-Drive belt pulley

1998 Daihatsu Terios Drive-Belt Pulley — Purpose, Service Advice, and FAQs

It’s relevant and fitted. The 1998 Daihatsu Terios (J100/J102, 1.3L HC‑EJ) uses accessory drive belts and multiple pulleys, including the crankshaft pulley (harmonic balancer), alternator pulley, water pump pulley, power steering pump pulley and the A/C compressor clutch pulley. This is documented in the Daihatsu Terios J100/J102 Workshop Manual (Maintenance – Drive Belt, Engine Mechanical – Cooling/Accessory Drive) and in the Daihatsu Electronic Parts Catalogue (J100G) which lists pulleys for the crankshaft, water pump, alternator, A/C and power steering. Aftermarket catalogues from Gates and Dayco also list separate alternator/water-pump and A/C belts for the 1998 Terios, confirming the accessory drive and pulley layout.

On this Terios, the drive-belt pulleys transfer crankshaft rotation to vital accessories: the alternator keeps the battery charged, the water pump circulates coolant, the power steering pump lightens the steering at low speeds, and the A/C compressor keeps the cabin cool. The crankshaft pulley often features a bonded rubber damper to reduce torsional vibration, protecting both the engine and the belts.

As part of regular servicing, pulleys and belts deserve a proper once-over. Belts should be checked for glazing, cracking, fraying, missing ribs, and proper tension. Pulleys should spin freely, run true and stay quiet, any wobble, rust dust, or gritty bearing feel calls for replacement. If the crankshaft pulley/damper shows perished rubber, radial cracks, or pulley misalignment, it should be swapped out promptly to avoid belt walk-off or charging/cooling issues.

Typical inspection intervals in local conditions: every 10,000–15,000 km or six months, with belt replacement commonly due around 60,000–90,000 km, depending on condition and climate. When changing a pulley, it’s good practice to replace the corresponding belt, as a worn belt can chew through a new pulley surface quickly. For A/C, the clutch/pulley bearing is a known wear point, any chirp or grind with A/C on or off is a hint. The Terios often runs separate belts, so correct routing and tension per the workshop specs matter. A straightedge check across pulleys helps pick up misalignment.

• Symptoms to watch: belt squeal on start-up, intermittent battery light, high engine temps in traffic, heavy steering at idle, or visible pulley wobble.
• Helpful tip: torque the crank pulley bolt to spec and use the correct holding tool, over-tightening belts to silence a squeal can accelerate bearing failure.

Popular questions about 1998 Daihatsu Terios drive-belt pulleys

How often should the Terios pulleys and belts be inspected or replaced?
Factory-style guidance is to inspect at each service (about every 10,000–15,000 km) and replace belts around 60,000–90,000 km based on condition. Pulleys are replaced as needed—any noise, play or misalignment is reason enough. In hotter Aussie and Kiwi climates, earlier attention pays off.

What noises point to a dodgy pulley versus just a worn belt?
A steady metallic chirp or grind that changes with A/C or steering load often points to a pulley bearing. A brief cold-start squeal that settles can be a loose or glazed belt. If the noise persists hot or you can feel roughness when spinning the pulley by hand (engine off), the pulley’s likely the culprit.

Can a single bad pulley damage the belts or other accessories?
Yes. A seized or misaligned pulley can shred a belt, overheat bearings in neighbouring accessories, and in the case of a failing crankshaft damper, cause vibration that shortens belt and accessory life. Replacing the faulty pulley and the affected belt together is the smart move.